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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24ad420b0089a787d9264a9283577c0252713e0f70fb50fd2804256a7f300df' 
  AND token = 'HQAl/AIrLbs4HAW+rzb2bYlYp/HSUe3ehe3PsdI6Y2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}